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    <h1>数据库</h1>
    <h2>关系型数据库</h2>
    <h3>PostgreSQL</h3>
    <h3>MySQL</h3>

    <h2>非关系型的数据库</h2>
    <h3>MongoDB</h3>

    <h2>基础常识</h2>

    <h3>对象关系映射ORMs</h3>
    <h3>增删改查ACID</h3>
    <h3>事务操作</h3>
    <h3>N+1 问题</h3>
    <h3>数据库规范化</h3>
    <h3>建立数据库索引</h3>



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